After following Parasound for a few years on various forums, I don't think that reproducing noise is an issue of theirs. I've seen noise issues spread across various brands, and Halo gear does have a ground lift switch. Usually noise ends up being through old wiring in the house, improperly grounded coax cables and such. I've never had any noise with the Parasound, though I did with Emotiva.

After following Parasound for a few years on various forums, I don't think that reproducing noise is an issue of theirs. I've seen noise issues spread across various brands, and Halo gear does have a ground lift switch. Usually noise ends up being through old wiring in the house, improperly grounded coax cables and such. I've never had any noise with the Parasound, though I did with Emotiva.

If you have a Parasound amp, try the star quad speaker cable (8 feet+, the length matters as the cable is doing the filtering) and you'll realized how much common mode noise get's amplified. If you never tried it you won't be aware of the difference. It's a very cheap tweak for massive improvement to the sound.

any recommendations as to whether better rca cables might help or perhaps better power mgmt by tring to get all my audio gear plugged into one socket?

Sounds like a possible ground loop. Yes, try to have everything plugged into one electrical outlet. I use a Bryston BIT power conditioner (unfortunately expensive), and have no hum from my speakers. I doubt different RCA cables would help, but maybe a local store could let you borrow some to give it a try.

If you have a Parasound amp, try the star quad speaker cable (8 feet+, the length matters as the cable is doing the filtering) and you'll realized how much common mode noise get's amplified. If you never tried it you won't be aware of the difference. It's a very cheap tweak for massive improvement to the sound.

I appreciate that, but I have zero noise. None whatsoever. I've also got 3 systems, I had four at one point but have been whittling it down, and I'm familiar with some of the noise issues that can occur. One time in my theater the front left channel was humming. Drove me crazy until I realized my voltage regulator got moved too close while working on the system, and was introducing the noise.